Home · Register · Search · View Winners · Software · Hosting · Software · Join Upload & Sell

My posts · My subscriptions
  

  Previous versions of Doctorbird's message #11614183 « Canon EF 200-400mm f/4L IS 1.4X: Quick Comparison »

  

Doctorbird
Offline
Upload & Sell: On
Re: Canon EF 200-400mm f/4L IS 1.4X: Quick Comparison


I wonder why the number 1.4 is not taken seriously an approximation to the square root of 2.0, 1.414, so that stacking two of them produces a real 2.0x instead of 1.96x. Then a 400 x 1.4 x 1.4 should be 800 instead of 784. I'm arguably sure that this is the intent.

Or, in other words two stacked 1.4x's approximates one 2x.

Db



Jun 11, 2013 at 09:48 PM



  Previous versions of Doctorbird's message #11614183 « Canon EF 200-400mm f/4L IS 1.4X: Quick Comparison »